References of "Bouquegneau, Jean-Marie"
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See detailTrophic position and cadmium content of dolphins and tunas from the Northeast Atlantic
Das, Krishna ULg; Bouquegneau, Jean-Marie ULg

in Cruz, J.; Raga, J. A.; Evans, P. G. H. (Eds.) European Research on Cetaceans - 13. Proceedings of the Thirteenth Annual Conference of the European Cetacean Society 5-8 April 1999. (1999)

Associations of tunas and dolphins in the wild are quite frequent events and the question arises how predators requiring similar diet in the same habitat share their environmental resources. As isotopic ... [more ▼]

Associations of tunas and dolphins in the wild are quite frequent events and the question arises how predators requiring similar diet in the same habitat share their environmental resources. As isotopic composition of an animal is related to that of its preys, stable isotopes (13C/12C and 15N/14N) analyses were performed in three predator species from the Northeast Atlantic: the striped dolphin, Stenella coeruleoalba, the common dolphin Delphinus delphis, and the albacore tuna, Thunnus alalunga, and compared to their previously described stomach content. Heavy metals (Cd, Zn, Cu and Fe) are mainly transferred through the diet and so, have been determined in the tissues of the animals. Albacore tunas muscles display higher 15N than in common and striped dolphins (mean: 11.4 0/00 vs. 10.3 0/00 and 10.4 0/00, respectively) which reflects its higher trophic level. Higher 13C are found in common (-18.4 0/00) and striped dolphin (-18.10/00) muscles than in albacore tuna (-19.3 0/00). Differences also appear in heavy metal contents, especially cadmium in muscles, lower in albacore tuna than in dolphins (0.37 and 0.1 ppm DW for striped and common dolphins vs.<0.07 ppm DW for albacore tuna) which probably reflects in dolphins a cadmium contamination through squid assimilation. These results suggest that, despite a close hunting association, the trophic position of these three predators is quite well distinct. [less ▲]

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See detailHeavy metals, organochlorines and polycyclic aromatic hydrocarbons in sperm whales stranded in Southern North sea during the 1994/1995 winter,
Hoolsbeek, L.; Joiris, C. R.; Debacker, Virginie ULg et al

in Marine Pollution Bulletin (1999), 38

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See detailStable isotope characteristics of some infra-littoral benthic food-webs of Papuasian eastern coasts
Dauby, Patrick ULg; Nyssen, Fabienne; Lepoint, Gilles ULg et al

Poster (1998, December)

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See detailTrophic relationships within intertidal communities of the Brittany coast: a stable carbon isotope analysis
Dauby, Patrick ULg; Khomsi, Ahmid; Bouquegneau, Jean-Marie ULg

in Journal of Coastal Research (1998), 14

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See detailFeeding of the sparid fish Sarpa salpa in a Posidonia seagrass ecosystem: del 13C evidence for a mixt diet.
Lepoint, Gilles ULg; Havelange, Stéphane; Dauby, Patrick ULg et al

Poster (1997, September)

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See detailIn situ measurements of the nitrogen assimilation by marine plants using 15N (Gulf of Calvi-Corsica)
Millet, Sylvie; Nyssen, Fabienne; Lepoint, Gilles ULg et al

Poster (1997, September)

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See detailStable carbon and nitrogen isotope ratios in surface SPM of the Gulf of Biscay
Dauby, Patrick ULg; Bouquegneau, Jean-Marie ULg; Frankignoulle, Michel et al

in OMEX-1 Final Report & OMEX-1 Data Set (1997)

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See detailEcotoxicological and pathological studies of common guillemots Uria aalge beached on the Belgian coast during six successive wintering periods (1989-90 to 1994-95)
Debacker, Virginie ULg; Holsbeek, Ludo; Tapia, German et al

in Diseases of Aquatic Organisms (1997), 29(3), 159-168

During 6 successive wintering periods, 727 common guillemots Uria aalge were recovered from Belgian beaches. One-third of the birds were already dead; the rest passed through rehabilitation centres where ... [more ▼]

During 6 successive wintering periods, 727 common guillemots Uria aalge were recovered from Belgian beaches. One-third of the birds were already dead; the rest passed through rehabilitation centres where they eventually died. All birds were monitored for general condition (body mass, fat reserves), eventual status of oiling and pathological changes (cachexia, acute hemorrhagic gastroenteropathy); 339 birds were sampled for trace metals (total and organic Hg, Cu, Zn, Fe, Cd) and PCB (polychlorinated biphenyl) analysis. Oiling is still a major cause of death for wintering pelagic seabirds: half of the birds showed signs of external or internal oiling, probably a still greater number of oiled birds never reach the shores. Although a low body mass can be considered a normal winter condition for wintering guillemots, pathology results showed that three-quarters of the studied animals were in a state of cachexia with emaciated pectoral muscle and lowered muscle lipid content. Elevated levels of Cu, Zn, Hg and PCBs were linked to the state of cachexia and may well represent an additional stress factor leading to the debilitation and death of part of the wintering guillemot population. [less ▲]

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See detailBiological oceanography and marine food webs: role of marine mammals and seabirds
Bouquegneau, Jean-Marie ULg; Debacker, Virginie ULg; Gobert, Sylvie ULg

in Jauniaux, Thierry; Bouquegneau, Jean-Marie; Coignoul, Freddy (Eds.) Marine Mammals, Seabirds and Pollution of Marine Systems (1997)

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See detailToxicological investigations on four sperm whales stranded on the Belgian coast: inoganic contaminants
Bouquegneau, Jean-Marie ULg; Debacker, Virginie ULg; Gobert, Sylvie ULg et al

in Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre (1997), 67

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See detailFeeding of the sparid fish Sarpa salpa in a seagrass ecosystem: Diet and carbon flux
Havelange, S.; Lepoint, Gilles ULg; Dauby, Patrick ULg et al

in Marine Ecology (1997), 18(4), 289-297

In Revellata Bay (Gulf of Calvi, Corsica, France), the sparid fish Sarpa salpa L. is the main macro-consumer of Posidonia oceanica (L.) DELILE leaf. Stomach contents were analysed and C-13/C-12 isotopic ... [more ▼]

In Revellata Bay (Gulf of Calvi, Corsica, France), the sparid fish Sarpa salpa L. is the main macro-consumer of Posidonia oceanica (L.) DELILE leaf. Stomach contents were analysed and C-13/C-12 isotopic ratios were measured in fish muscle and potential food sources (algae, P. oceanica leaf and its epiphytes) to determine their relative contribution to the fish diet. S. salpa has an age-related mixed diet: juveniles are plankton feeders, young, sub-adults and adults are herbivorous, and, the older the individuals, the higher the relative contribution of P. oceanica to the diet. Our results and former studies of carbon stocks and fluxes in the P. oceanica bed of Revellata Bay have enabled an estimation of the general impact of S. salpa grazing on infralittoral communities: the studied species consumes 24 g C.m-2.a(-1) from P. oceanica leaf, 4.8 from epiphytes and 13 from epilithic algae. The fish net production and biomass turnover in that zone have been estimated to be 1.2 g C.m(-2).a(-1) and 1.5 a(-1), respectively. [less ▲]

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See detailA gas chromatographic separation for the H and C stable isotope ratio determination of coal compounds
Antenucci, Diano; Bouquegneau, Jean-Marie ULg; Brasseur, Alain et al

in Analytical Chemistry (1997), 69(11), 2030-2034

A new, completely automated gas chromatography technique has been developed to separate the different gaseous compounds produced during underground coal gasification for their C-13/C-12 and D/H isotope ... [more ▼]

A new, completely automated gas chromatography technique has been developed to separate the different gaseous compounds produced during underground coal gasification for their C-13/C-12 and D/H isotope ratio measurements, ?he technique was designed for separation and collection of Hz, CO, CO2, H2O, H2S, CH4, and heavier hydrocarbons. These gaseous compounds are perfectly separated by the gas-phase chromatograph and quantitatively sent to seven combustion and collection lines. H-2, CO, CH4, and heavier hydrocarbons are quantitatively oxidized to CO2 and/or H2O. The isotopic analyses are performed by the sealed-tube method, The zinc method is used for reduction of both water and H2S to hydrogen for D/H analysis, Including all preparation steps, the reproducibility of isotope abundance values, for a quantity higher than or equal to 0.1 mt of individual components in a mixture (5 mt of gases being initially injected in the gas chromatograph), is +/-0.1 parts per thousand for delta(13)C(PDB) and +/-6 parts per thousand for delta(13)C(PDB) and +/-6 parts per thousand for delta(SMOW). [less ▲]

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See detailFeeding of Sarpa salpa in a Posidonia seagrass ecosystem: del 13C evidence for a mixed diet
Havelange, Stéphane; Lepoint, Gilles ULg; Dauby, Patrick ULg et al

Conference (1996, September)

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See detailStable carbon isotope ratios in surface water SPM of the Gulf of Biscay
Dauby, Patrick ULg; Frankignoulle, Michel; Bouquegneau, Jean-Marie ULg

Conference (1996, May)

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See detailThe health status of the North Sea: ecotoxicological approach
Bouquegneau, Jean-Marie ULg; Dauby, Patrick ULg; Debacker, Virginie ULg et al

in Dialogue between Scientists and Users of the Sea (1996)

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See detailRole of the metallothioneins in metal regulation by the guillemot Uria aalge
Bouquegneau, Jean-Marie ULg; Debacker, Virginie ULg; Gobert, Sylvie ULg et al

in Comparative Biochemistry and Physiology. C : Comparative Pharmacology and Toxicology (1996), 113C(2), 135-139

Guillemots, like other seabird species living in the North Sea, appear to be heavily contaminated by copper. Metallothioneins are present in both liver and kidney but, at least in the specimens stranded ... [more ▼]

Guillemots, like other seabird species living in the North Sea, appear to be heavily contaminated by copper. Metallothioneins are present in both liver and kidney but, at least in the specimens stranded along the Belgian coast, fail to maintain constant the copper, zinc and cadmium load of the high molecular weight soluble proteins of both organs, stressing the potential toxic role of these metals, mainly copper. [less ▲]

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